negative-test-generator

def test_create_order_succeeds():
    response = post('/api/orders',
                    headers={'Authorization': f'Bearer {token}'},
                    json={'sku': 'SKU-1', 'qty': 2})
    assert response.status_code == 201
    assert response.json()['order_id']

import pytest
from tests.fixtures import token, expired_token, free_tier_token
from tests.payloads import XSS, SQLI

# 1. Schema violations
@pytest.mark.parametrize('body,expected_status,expected_field', [
    ({'qty': 2},                  400, 'sku'),         # missing required
    ({'sku': 'SKU-1'},            400, 'qty'),         # missing required
    ({'sku': 'SKU-1', 'qty': 'two'}, 400, 'qty'),    # wrong type
    ({'sku': 'SKU-1', 'qty': 0},  400, 'qty'),         # below min
    ({'sku': 'SKU-1', 'qty': -1}, 400, 'qty'),         # negative
    ({'sku': 'SKU-1', 'qty': 1000000}, 400, 'qty'),    # above max
    ({'sku': 'INVALID-SKU', 'qty': 2}, 400, 'sku'),     # unknown enum
])
def test_create_order_schema_rejects(body, expected_status, expected_field):
    response = post('/api/orders',
                    headers={'Authorization': f'Bearer {token}'},
                    json=body)
    assert response.status_code == expected_status
    assert expected_field in response.json().get('errors', {})

# 2. Auth failures
def test_create_order_no_token():
    response = post('/api/orders', json={'sku': 'SKU-1', 'qty': 2})
    assert response.status_code == 401

def test_create_order_expired_token():
    response = post('/api/orders',
                    headers={'Authorization': f'Bearer {expired_token}'},
                    json={'sku': 'SKU-1', 'qty': 2})
    assert response.status_code == 401

# 3. Authorization failures
def test_create_order_free_tier_blocked_for_premium_sku():
    response = post('/api/orders',
                    headers={'Authorization': f'Bearer {free_tier_token}'},
                    json={'sku': 'PREMIUM-1', 'qty': 1})
    assert response.status_code == 403

# 6. Adversarial payloads
@pytest.mark.parametrize('payload', XSS + SQLI)
def test_create_order_handles_adversarial_sku(payload):
    response = post('/api/orders',
                    headers={'Authorization': f'Bearer {token}'},
                    json={'sku': payload, 'qty': 1})
    # Either reject (preferred) or escape - never pass through with execution
    assert response.status_code in (400, 404, 422)
    assert '<script>' not in response.text

## Negative tests for `<endpoint>` - `<verb> <path>`

**Happy path:** `tests/<file>::test_<happy_name>`
**Negative companions generated:** N (across 6 categories)

### Tests by category

| Category               | Count | File                                                |
|------------------------|------:|-----------------------------------------------------|
| Schema violations      |    7  | `tests/<file>::test_<endpoint>_schema_rejects`     |
| Auth failures          |    2  | `tests/<file>::test_<endpoint>_no_token` etc.       |
| Authorization failures |    1  | `tests/<file>::test_<endpoint>_unauthorized`        |
| Rate/quota failures    |    0  | (skipped; rate-limit not yet implemented)           |
| Conflict/state errors  |    1  | `tests/<file>::test_<endpoint>_duplicate`           |
| Adversarial payloads   |    8  | `tests/<file>::test_<endpoint>_handles_adversarial`|

### Skipped categories

- Rate/quota failures: rate limiting not yet implemented; revisit when added.
- Server errors: covered by `api-chaos-runner` in a separate suite.

### Recommended next step

1. Run the new negative tests; expect all to pass given the
   documented behavior.
2. Any failure indicates a real gap - either the validator is
   missing the case OR the assertion is wrong.
3. For passes: commit.